Update app.py

app.py

@@ -28,6 +28,8 @@ class CurrentTimeTool(Tool):
                 "description": "Timezone string (e.g., 'America/New_York')"
             }
         }
+        self.output_type="string"
+
     def __call__(self, timezone: str) -> str:
         try:
             tz = pytz.timezone(timezone)
@@ -53,6 +55,7 @@ class WikipediaTool(Tool):
                 "default": 2
             }
         }
+        self.output_type="string"
        
     def __call__(self, query: str, sentences: int = 2) -> str:
         try: